Good day to all who faced such a problem.

There is a Consignment table, it has a child table of goods in the invoice. And there is a table of goods.

MVC 5 It was possible to make the following construction on the pages:

@foreach (var item in Model) { <tr> <td> @Html.DisplayFor(modelItem => item.Name) </td> <td> @foreach (var items in item.ListProdukts) { @Html.DisplayFor(modelItem => items.Produkts.ProduktName) }

But in ASP.Net Core this does not work. While the studio gives all these fields in the code tips.

Model:

 namespace Proba3.Models { public class Invoice { public int InvoiceId { get; set; } public string InvoiceName { get; set; } public ICollection<ListProdukt> ListProdukts { get; set; } } } namespace Proba3.Models { public class ListProdukt { public int ListProduktId { get; set; } public int ProduktId { get; set; } public virtual Produkt Produkts { get; set; } public int InvoiceId { get; set; } public virtual Invoice Invoices { get; set; } } } namespace Proba3.Models { public class Produkt { public int ProduktId { get; set; } public string ProduktName { get; set; } public ICollection<ListProdukt> ListProdukts { get; set; } } }

Controllers:

 using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using Microsoft.AspNetCore.Mvc; using Microsoft.AspNetCore.Mvc.Rendering; using Microsoft.EntityFrameworkCore; using Proba3.Data; using Proba3.Models; namespace Proba3.Controllers { public class InvoicesController : Controller { private readonly ApplicationDbContext _context; public InvoicesController(ApplicationDbContext context) { _context = context; } // GET: Invoices public async Task<IActionResult> Index() { var applicationDbContext = _context.Invoice.Include(c => c.ListProdukts); return View(await applicationDbContext.ToListAsync()); }

Views:

 @model IEnumerable<Proba3.Models.Invoice> @{ ViewData["Title"] = "Index"; } <h2>Index</h2> <p> <a asp-action="Create">Create New</a> </p> <table class="table"> <thead> <tr> <th> @Html.DisplayNameFor(model => model.InvoiceName) </th> <th></th> </tr> </thead> <tbody> @foreach (var item in Model) { <tr> <td> @Html.DisplayFor(modelItem => item.InvoiceName) </td> <td> @foreach (var items in item.ListProdukts) { <p>@Html.DisplayFor(modelItem => items.ProduktId)</p> <p>@Html.DisplayFor(modelItem => items.Produkts.ProduktName)</p> } </td> <td>

Why not show ProduktName?

    1 answer 1

    The answer was given on github.

    It turns out ASP.NET Core now does not add child elements by default. Details can be read in English here: docs.asp.net

    In my case, the Controller should add:

    in line:

     var applicationDbContext = _context.Invoice.Include(c => c.ListProdukts).ThenInclude(c => c.Produkts);

    this:

     .ThenInclude(c => c.Produkts);